End Point evaluation - Choice of Method/indexes Periodontal disease is an inflammatory, infectious disease which destroys tooth attachment including bone and fibres. Treatment is aimed at halting or retarding this destruction. At 3 months, 1, 3 and 5 years the CAL and RAL as a parameter for periodontal disease and PD/BoP as parameters for inflammation will be evaluated and statistically treated between the groups. Pocket Depth (PD) and bleeding on probing (BoP) are only surrogate parameters as the disease is defined as "loss of attachment which includes bone". Periodontitis is measured in CAL or on Xrays = RAL.